Smog shrouds Chile's capital Santiago, June 22, 2015. Chilean authorities declared an environmental emergency for the Santiago metropolitan region for Monday, forcing more than 900 industries to temporarily shut down and about 40 percent of the capital's 1.7 million cars off the roads. The emergency, the first since 1999, will be in place for 24 hours and can be extended further if authorities deem conditions have not improved. REUTERS/Ueslei Marcelino TPX IMAGES OF THE DAY

Smog shrouds Chile's capital Santiago, June 22, 2015. Chilean authorities declared an environmental emergency for the Santiago metropolitan region for Monday, forcing more than 900 industries to temporarily shut down and about 40 percent of the capital's 1.7 million cars off the roads. The emergency, the first since 1999, will be in place for 24 hours and can be extended further if authorities deem conditions have not improved. REUTERS/Ueslei Marcelino TPX IMAGES OF THE DAY